<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>37.TAB选项卡显示效果基类开发</title>
  <style>
    * {
      padding: 0;
      margin: 0;
    }

    body {
      display: flex;
      justify-content: center;
      align-items: center;
      width: 100vw;
      height: 100vh;
    }

    main {
      width: 400px;
      flex-direction: column;
      position: relative;
      margin-right: 20px;
    }

    main nav {
      display: flex;
      height: 50px;
      align-items: center;
    }

    main nav a {
      background: #95a5a6;
      margin-right: px;
      padding: 10px 20px;
      border: solid 1px #333;
      color: #fff;
     /* text-decoration: none; */
    }

    main nav a:first-of-type {
      background: #e67e22;
    }

    section {
      height: 200px;
      width: 100%;
      background: #f1c40f;
      position: absolute;
      font-size: 5em;
      /*display: none;*/
    }

    .hd-tab section:first-of-type {
      display: block;
    }

    section:nth-child(even) {
      background: #27ae60;
    }
  </style>
</head>



<body>
  <main class="tab1">
    <nav>
      <a href="javascript:;"> 后盾人<></a>
      <a href="javascript:;">hdcms</a>
    </nav>
    <section>1</section>
    <section>2</section>
  </main>
  <main class="tab2">
    <nav>
      <a href="javascript:;"> 后盾人<></a>
      <a href="javascript:;">hdcms</a>
    </nav>
    <section>1</section>
    <section>2</section>
  </main>
</body>

<script>
  function extend(sub,sup){
    sub.prototype = Object.create(sup.prototype);
    sub.prototype.constructor = sub;
    
  }
  function Animation () { }
  Animation.prototype.hide = function () {
    this.style.display = 'none';
  }
  Animation.prototype.background = function (color) {
    this.style.backgroundColor = color;
  }
  let tab = document.querySelector(".tab2");
  Animation.prototype.background.call(tab,'red');
</script>

</html>